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Dirk Coster was born in 1889.
Marc de Coster died on July 24, 2012, in Manhattan, New York, USA of cancer.
Coster is known as the co-discoverer of Hafnium (Hf) in 1923, along with George Charles Von Hevesy.
Hafnium was discovered by Dirk Coster and Georg von Hevesy in 1923 in Copenhagen, Denmark
Hafnium was discovered by Dirk Coster and Von Hevesy in zirconium minerals after X-ray spectrometric analysis.